You will not be allowed to "reshop" your friends cruise, as you have to be physically onboard for that to happen. You'll get a friends and family card with entitles your friends to the OBC, but not the 10%. You're allowed to book as many rooms as there as people onboard and they must be booked in the room. Once onboard with your friends you can then reallocate the people to the correct rooms, but someone who is onboard with you in Feb must be booked in their room for them to receive the 10%. You can have the price out your friends room and then decide if you want to book it (you'll have to pay deposit) and have them cancel their ressie when you get home.
This has not been my experience at all! On my last three cruises, I have been able to reshop future cruises for friends and family members. They do not have to be physically on the ship to do this. I think they may need to be booked on the future cruise with you (meaning you both need to have reservations for the same sailing date, though this can be changed by one or both of you at any time after booking.)
To the OP, it's easiest to reshop your friend or family member's reservations if they have booked their reservation directly with
DCL without assigning it to a
travel agent. In that case, when you reshop it, the onboard booking agent can transfer the deposit and room assignment, along with all of the information, from the original reservation to the new reservation that has the onboard benefits on it. The reservation could then be assigned to a travel agent if that is desired, so your friend/family can get the TA's full OBC offer as well since it would count as a new reservation. This is the easiest way to do it, and all I usually bring with me in that case is their reservation number (at a minimum) and a printout of their reservation and cost summary, so you can assess whether it's a good deal or not, and determine that all the information was transferred over completely.
While the above situation is the easiest approach, if they have a TA, there may be instances where they want to book their reservation with a TA from the beginning, to get the TA's OBC, in case prices rise before you sail or their category or sailing sells out and you are unable to rebook the reservation for them. In that case, you can still reshop their reservation, but you may need their credit card information in case they have the pay the deposit again (though it will only be 10% instead of 20%). That's been my experience, though kcashner has mentioned that at least once the booking agent was able to call her TA to get the deposit transferred. (That hasn't worked for me.) In that case, the rebooking agent will make a new reservation in the same category (or GTY) for your friends, and will collect a 10% deposit, and assign the reservation to your friend's TA that you instruct it to go to. After the new deposit is made, or after you get off the ship (depending on your access to internet) your friends need to let their TA know about the new reservation, and the TA can take care of getting the original room assignment moved to the new reservation, and requesting the refund of the original deposit paid.
Nope, you can book as many cabins as there are people in your room, but it doesn't have to the the SAME people.
On a cruise with two girlfriends, we were EACH allowed to do multiple cabin bookings. I booked a cruise for myself and then a cabin for my sister (who was not with me at the time). Both my cabin mates each booked one or two dummy cruises for themselves.
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I've heard the rule about reservations being limited to the number of people in your room, but I've had the rebooking agents on the Magic and Wonder explain it slightly differently. I've been told that you are limited to how many cruises you book for others to how many people are in your travel party. I assume this it to keep people or TAs from taking 50 reservations with them onboard to rebook for others, and tying up the rebooking agent from serving current cruisers. As to reservations made for anyone in my travel party, I have been told that there is no limit. So if I wanted to make 10 future or dummy reservations for our family of 4, then we would be able to do it on a single sailing.
In December, I rebooked 3 rooms for friends and family, and booked 2 dummy reservations for myself, and didn't have any problem in doing so.